I think a lot of these are phrases that had emotional impact at the time. For example, these phrases:

   >Just between ourselves....
   >Well, sir, you'll be so all-fired happy
   >Say, you'll have a streak of []luck
   >Right now while the going's good

These would be like the equivalent in our time of phrases like,

    >You won't believe what happens next...
    >These ten things will.....
    >This one trick discovered by a mom.....

Some of those phrases really make you want to click, until they get overused and the public gets inured to them. Then they will be replaced by other phrases in the future. That is not the only skill the writer of this copy had, of course, but it's one of them.